A multi-head power tool

Abstract

The present application relates to a multi-head power tool, belonging to the technical field of power tools; it includes a machine head and a machine body, and a connecting mechanism is jointly arranged between the machine head and the machine body, and the connecting mechanism is used to connect or separate the machine head and the machine body; the connecting mechanism includes a clamping rod, a clamping block and a driving component, the clamping rod is rotatably connected to the end wall of the machine body facing the machine head, the clamping block is arranged on the end wall of the machine head facing the machine body, a clamping groove for the clamping rod to be inserted is arranged on the peripheral wall of the clamping block, and the driving component is used to drive the clamping rod to rotate and insert into the clamping groove when the end walls of the machine head and the machine body facing each other are mutually attached; the present application has the effect of realizing the efficient and convenient disassembly and assembly of the machine head and the machine body.

Description

Technical Field

[0001] This application relates to the technical field of power tools, and in particular to a multi-head power tool. Background Art

[0002] Power tools include polishers, grinders, sanders, gun drills, electric shovels, etc. All of the above-listed power tools include a body and a head. A motor is installed inside the body, and the output shaft of the motor delivers power to a working component built in the head through a transmission component, causing the working component to rotate or vibrate, so as to achieve functions such as polishing, grinding, sanding, curve cutting, drilling, or shoveling.

[0003] The body and the head of the existing power tool can be detachably connected. By setting bolts on the head and threading the screw part of the bolt through the head and threadedly connecting it to the side wall of the body, the connection between the head and the body is achieved. For the related technology described above, the inventor found that when multiple bolts are set, the operation of screwing the bolts is time-consuming and laborious, resulting in low loading and unloading efficiency, so it needs to be improved. Summary of the Invention

[0004] In order to achieve the technical effect of efficient loading and unloading of the head and the body of the power tool, this application provides a multi-head power tool.

[0005] A multi-head power tool provided by this application adopts the following technical solutions:

[0006] A multi-head power tool includes a head and a body. A connection mechanism is jointly provided between the head and the body. The connection mechanism is used to connect or separate the head and the body. The connection mechanism includes a clamping rod, a clamping block, and a driving component. The clamping rod is rotatably connected to the end wall of the body facing the head, the clamping block is arranged on the end wall of the head facing the body, a clamping groove for inserting the clamping rod is arranged on the peripheral wall of the clamping block, and the driving component is used to drive the clamping rod to rotate and insert into the clamping groove when the end walls of the head and the body facing each other are mutually attached.

[0007] By adopting the above technical solutions, when installation is required, the head is driven to move towards the body, and the ends of the head and the body are attached. At this time, the clamping rod is located outside the clamping groove. Then, the driving component is used to drive the clamping rod to rotate towards the clamping groove, so that the clamping rod is inserted into the clamping groove. At this time, the clamping rod will prevent the body and the head from separating from each other. By replacing the bolts with the mutual clamping of the clamping rod and the clamping groove, the efficient and convenient loading and unloading of the head and the body is realized.

[0008] Preferably, the driving assembly includes a rotating shaft, a first torsion spring, a first pulling rope, and a docking member. The clamping rod is rotatably connected to the end wall of the fuselage through the rotating shaft. The first torsion spring is sleeved on the rotating shaft. One end of the first torsion spring is connected to the end wall of the fuselage, and the other end is connected to the side wall of the clamping rod. One end of the first pulling rope is connected to the clamping rod. The docking member is used to pull or release the first pulling rope so that the clamping rod rotates around the rotating shaft under the action of the first pulling rope.

[0009] By adopting the above technical solution, when the nose and the fuselage are separated from each other, the first torsion spring is not deformed. At this time, the clamping rod can be inserted into the clamping groove under the elastic force of the first torsion spring. When it is necessary to install the nose and the fuselage, first pull the first pulling rope through the docking member so that the first pulling rope pulls the clamping rod. At this time, the first torsion spring is deformed, and the clamping rod rotates away from the center position of the fuselage under the pulling of the first pulling rope to facilitate the insertion of the clamping block. When the end walls of the fuselage and the nose facing each other are in contact, release the first pulling rope through the docking member. At this time, the first torsion spring resumes its elastic deformation, and the clamping rod is inserted into the clamping groove under the elastic force of the first torsion spring to realize the splicing of the nose and the fuselage.

[0010] Preferably, the docking member includes a first rotating rod rotatably connected to the inside of the fuselage, a second torsion spring sleeved on the first rotating rod, and a first pressing rod for pressing against the end of the first rotating rod. One end of the first pulling rope away from the clamping rod is connected to the end of the first rotating rod. One end of the second torsion spring is connected to the first rotating rod, and the other end is connected to the inside of the fuselage. The first pressing rod is located at one end of the first rotating rod away from the first pulling rope. The first rotating rod is located between the first pulling rope and the first pressing rod. The first pressing rod is slidably connected to the inside of the fuselage, and the end of the first rotating rod is located on the extension line of the sliding direction of the first pressing rod.

[0011] By adopting the above technical solution, the first pressing rod presses against the end of the first rotating rod so that the other end of the first rotating rod moves upward to pull the first pulling rope. At this time, the second torsion spring is in a deformed state. When the first pressing rod releases the pressing on the first rotating rod, the first rotating rod will reset under the elastic deformation of the second torsion spring, thereby releasing the first pulling rope.

[0012] Preferably, a chamber is provided inside the fuselage. The docking member is located in the chamber. A fixing groove is formed in the side wall of the fuselage along the circumferential direction of the fuselage. The fixing groove is communicated with the chamber. A limiting spring is arranged on the inner wall of the fixing groove, and the other end of the limiting spring is connected to the first pressing rod.

[0013] By adopting the above technical solution, in order to reduce the jitter of the first pressure rod along its sliding direction under the influence of external vibration forces and even cause the first rotating rod to pull the first pulling rope, which in turn causes the clamping rod to rotate, a fixing groove is specifically provided on the peripheral wall of the fuselage. The initial position of the first pressure rod is defined by a limiting spring. When the limiting spring is not deformed, the first pressure rod disengages from the chamber and is completely located within the fixing groove. When it is necessary to pull the first pulling rope, it can be considered to first slide the first pressure rod into the chamber and then press the first pressure rod to make the first pressure rod press against the first rotating rod.

[0014] Preferably, a dust-proof cover plate is slidably connected to the peripheral wall of the clamping block near the clamping groove. The dust-proof cover plate is used to open and close the notch of the clamping groove, and a moving member for driving the dust-proof cover plate to slide and thus open and close the notch of the clamping groove is provided on the machine head.

[0015] By adopting the above technical solution, before the clamping rod is inserted into the clamping groove, the dust-proof cover plate covers the notch of the clamping groove, playing a dust-proof role. When it is necessary to insert the clamping rod into the clamping groove, first drive the dust-proof cover plate to slide through the moving member so that the dust-proof cover plate opens the notch of the clamping groove for the clamping rod to be inserted into the clamping groove.

[0016] Preferably, the moving member includes a second pulling rope, a second rotating rod, a second pressure rod, a third torsion spring and a return spring; the second rotating rod is rotatably connected within the machine head, the third torsion spring is sleeved outside the second rotating rod, and one end of the third torsion spring is connected to the second rotating rod and the other end is connected to the inside of the machine head; the second pressure rod is slidably connected within the machine head for pressing against the end of the second rotating rod, one end of the second pulling rope is connected to the side wall of the dust-proof cover plate, and the other end is connected to one end of the second rotating rod away from the second pressure rod. One end of the return spring is connected to the dust-proof cover plate, and the other end is connected to the side wall of the clamping block, and the telescopic direction of the return spring is parallel to the sliding direction of the dust-proof cover plate.

[0017] By adopting the above technical solution, by pressing the second pressure rod, the second pressure rod slides in the direction close to the second rotating rod, so that the second pressure rod presses against the second rotating rod, and the end of the second rotating rod close to the second pulling rope pulls the second pulling rope, thereby driving the dust-proof cover plate to slide by the second pulling rope. At this time, the third torsion spring is in a deformed state. After the clamping rod is inserted into the clamping groove, release the pressing on the second pressure rod, and then the dust-proof cover plate re-covers the notch of the clamping groove under the elastic forces of the third torsion spring and the return spring, playing a dust-proof role while also preventing the clamping rod from disengaging from the clamping groove.

[0018] Preferably, the moving member further includes an insertion rod. The insertion rod is slidably connected within the clamping block, and the sliding direction of the insertion rod is parallel to the sliding direction of the dust-proof cover plate. One end of the insertion rod is connected to the side wall of the dust-proof cover plate, and the other end penetrates through the clamping groove. A locking hole for inserting the insertion rod is provided on the peripheral wall of the clamping rod.

[0019] By adopting the above technical solution, when the dust-proof cover plate slides, since the insertion rod is connected to the dust-proof cover plate, the insertion rod moves with the dust-proof cover plate. Specifically, when the dust-proof cover plate moves away from the notch of the clamping groove, the insertion rod disengages from the clamping groove. When the dust-proof cover plate moves towards the notch of the clamping groove, the end of the insertion rod is inserted into the clamping groove and further inserted into the locking hole to prevent the clamping rod from rotating.

[0020] Preferably, a magnet sheet is arranged on the peripheral wall of the clamping rod, and an adsorption iron sheet magnetically fixed to the magnet sheet is arranged on the inner wall of the clamping groove.

[0021] By adopting the above technical solution, the magnet sheet and the adsorption iron sheet are provided to, on the one hand, realize the stable insertion of the clamping rod into the clamping groove, and on the other hand, play a positioning role to ensure that the insertion rod can be smoothly inserted into the locking hole.

[0022] Preferably, a sealing strip is arranged along the circumferential direction of the end wall of the machine head facing the machine body, and a sealing groove for inserting the sealing strip is formed in the end wall of the machine body.

[0023] By adopting the above technical solution, the sealing strip and the sealing groove are provided to, on the one hand, increase the contact area between the machine head and the machine body to realize the stable connection between the machine head and the machine body, and on the other hand, play a waterproof role to reduce the infiltration of external moisture into the connection part between the machine body and the machine head.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. When installation is required, the machine head is driven to move towards the machine body, and the end parts of the machine head and the machine body are fitted together. At this time, the clamping rod is located outside the clamping groove. Then, the clamping rod is driven to rotate towards the clamping groove by the driving component so that the clamping rod is inserted into the clamping groove. At this time, the clamping rod can prevent the machine head and the machine body from separating from each other. By replacing the bolt with the mutual clamping of the clamping rod and the clamping groove, the efficient and convenient loading and unloading of the machine head and the machine body are realized.

[0026] 2. Before the clamping rod is inserted into the clamping groove, the dust-proof cover plate covers the notch of the clamping groove to play a dust-proof effect. When the clamping rod needs to be inserted into the clamping groove, the dust-proof cover plate is first driven to slide by the moving part so that the dust-proof cover plate opens the notch of the clamping groove for the clamping rod to be inserted into the clamping groove; in addition, when the dust-proof cover plate moves away from the notch of the clamping groove, the insertion rod disengages from the clamping groove. When the dust-proof cover plate moves towards the notch of the clamping groove, the end of the insertion rod is inserted into the clamping groove and further inserted into the locking hole to prevent the clamping rod from rotating. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram showing the structure of the machine head and the machine body of a multi-head power tool in the embodiment.

[0028] Figure 2 It is a schematic diagram of the end structure of the machine head towards one end of the fuselage in the embodiment to show the orientation.

[0029] Figure 3 It is a cross-sectional view of the internal structure of the machine head in the embodiment to show the internal structure.

[0030] Figure 4 It is a cross-sectional view of the embodiment to show the positional relationship between the fixed groove and the chamber.

[0031] Figure 5 It is a cross-sectional view of the internal structure of the fuselage in the embodiment to show the internal structure of the fuselage.

[0032] Figure 6 It is Figure 5 an enlarged schematic diagram showing the structure at position A in

[0033] Explanation of reference numerals: 1. Machine head; 11. Rotating shaft; 12. Moving part; 121. Second pulling rope; 122. Second rotating rod; 123. Second pressing rod; 1231. Support spring; 124. Third torsion spring; 125. Return spring; 14. Cavity; 2. Fuselage; 21. Chamber; 22. Fixed groove; 221. Limit spring; 231. Sealing groove; 3. Connecting mechanism; 31. Clamping rod; 311. Magnet sheet; 312. Locking hole; 32. Clamping block; 321. Clamping groove; 3211. Adsorption iron sheet; 322. Dust-proof cover plate; 323. Yielding chamber; 333. Insert rod; 33. Driving assembly; 331. Rotating shaft; 332. First torsion spring; 335. First pulling rope; 334. Docking part; 3341. First rotating rod; 3342. Second torsion spring; 3343. First pressing rod. Detailed implementation manners

[0034] The following further describes the present application in detail in conjunction with the attached Figures 1-6 drawings.

[0035] An embodiment of the present application discloses a multi-head power tool. Referring to Figure 1 and Figure 2 , the multi-head power tool includes a machine head 1 and a fuselage 2. A working component is arranged in the machine head 1, and a motor for driving the working component to rotate is arranged in the fuselage 2. The working component includes a rotating shaft 11. One end of the rotating shaft 11 facing the fuselage 2 can be key-connected to the driving end of the motor when the machine head 1 and the fuselage 2 are mutually assembled; a connecting mechanism 3 is jointly arranged at the ends of the machine head 1 and the fuselage 2 close to each other. The connecting mechanism 3 is used to assemble or separate the machine head 1 and the fuselage 2 from each other.

[0036] Referring to Figure 1 , Figure 2 and Figure 3The connecting mechanism 3 includes a clamping rod 31, a clamping block 32 and a driving assembly 33; the driving assembly 33 includes a rotating shaft 331, a first torsion spring 332, a first pull rope 335 and a docking piece 334; in the embodiment of the present application, the number of the clamping rods 31 is 2, the rotating shaft 331, the first torsion spring 332, the first pull rope 335 and the docking piece 334 are all arranged in a one-to-one correspondence with the clamping rod 31, the rotating shaft 331 is rotatably connected to the end wall of the fuselage 2, the first torsion spring 332 is sleeved on the corresponding outside of the rotating shaft 331, the clamping rod 31 is fixedly sleeved on the corresponding outside of the rotating shaft 331, one end of the first torsion spring 332 is welded to the side wall of the clamping rod 31, and the other end is welded to the end wall of the fuselage 2.

[0037] Reference Figure 3 and Figure 4 The body 2 has a chamber 21 formed inside, and the chamber 21 corresponds to the docking piece 334, and the docking piece 334 is located in the corresponding chamber 21; the docking piece 334 includes a first rotating rod 3341, a second torsion spring 3342 and a first pressing rod 3343, the first rotating rod 3341 is rotatably connected to the chamber 21 through a pin, the second torsion spring 3342 is sleeved on the outside of the first rotating rod 3341, and one end of the second torsion spring 3342 is welded to the side wall of the first rotating rod 3341, and the other end is welded to the inner wall of the chamber 21. One end of the first pull rope 335 is fixedly bonded to the side wall of the corresponding clamping rod 31, and the other end is fixedly bonded to the end wall of the first rotating rod 3341.

[0038] Reference Figure 3 and Figure 4 The first pressure rod 3343 is located at one end of the first rotating rod 3341 away from the first pull rope 335. The side wall of the fuselage 2 near each chamber 21 is provided with a fixing groove 22 connected to the corresponding chamber 21. A limiting spring 221 is inserted into the inner wall of each fixing groove 22. One end of the limiting spring 221 is welded to the inner wall of the fixing groove 22, and the other end is welded to the side wall of the first pressure rod 3343. When the limiting spring 221 is not deformed, the first pressure rod 3343 is limited by the tension of the limiting spring 221. When the operator pushes the first pressure rod 3343 to make the first pressure rod 3343 slide into the chamber 21 along the length direction of the fixed groove 22, the first pressure rod 3343 is pressed, and the first rotating rod 3341 is pressed to rotate around the pin axis, and the end of the first rotating rod 3341 away from the first pressure rod 3343 pulls the first pull rope 335, and the first pull rope 335 pulls the clamping rod 31, thereby causing the two clamping rods 31 to rotate, and the first torsion spring 332 is deformed.

[0039] Reference Figure 3 and Figure 5The locking cam 321 is provided with a lock hole 322 at the bottom of the locking cam 324, and the locking cam 322 is provided with a lock hole 323 at the bottom of the locking cam 324. The locking cam 321 is provided with a lock hole 323 at the bottom of the locking cam 324, and the lock hole 323 is provided with a lock hole 323 at the bottom of the locking cam 324.

[0040] Reference Figure 3 and Figure 5 The circumferential wall of the clamping block 32 near the clamping groove 321 is slidably connected with a dust cover plate 322, and the dust cover plate 322 is used to open and close the notch of the clamping groove 321 during the sliding process; a plug rod 333 is welded to the side wall of the dust cover plate 322, and one end of the plug rod 333 away from the dust cover plate 322 passes through the side wall of the clamping groove 321 and can be inserted into the inside of the clamping groove 321; a locking hole 312 for inserting the plug rod 333 is provided on the side wall of the clamping rod 31, and a moving part 12 for driving the dust cover plate 322 to slide is provided on the machine head 1. The dust cover plate 322 can be moved to a position where it can cover the notch of the clamping groove 321 under the drive of the moving part 12. In addition, a yield chamber 323 is provided inside the clamping block 32 for the plug rod 333 to slide with the dust cover plate 322

[0041] Reference Figure 5 and Figure 6 A cavity 14 is provided inside the machine head 1, and the moving member 12 is located in the cavity 14. The moving member 12 includes a second pull rope 121, a second rotating rod 122, a second pressure rod 123, a third torsion spring 124, and a reset spring 125. The second rotating rod 122 is rotatably connected to the inner wall of the cavity 14 through a pin shaft, and the third torsion spring 124 is sleeved on the second pressure rod 123, and one end of the third torsion spring 124 is welded to the side wall of the second rotating rod 122, and the other end is welded to the inner wall of the cavity 14. The second pressure rod 123 is located at one end of the second rotating rod 122, and is used to press the second rotating rod 122 so that the second rotating rod 122 rotates around the pin shaft. A support spring 1231 is sleeved on the outside of the second pressure rod 123, and one end of the support spring 1231 is welded to the inner wall of the cavity 14, and the other end is welded to the side wall of the second pressure rod 123.

[0042] Reference Figure 5 and Figure 6One end of the second pull rope 121 is bonded to the end of the second rotating rod 122, and the second pull rope 121 is located at one end of the second rotating rod 122 away from the second pressure rod 123, and the other end of the second pull rope 121 passes through the machine head 1 and is bonded to the side wall of the dust cover 322; one end of the return spring 125 is welded to the side wall of the dust cover 322, and the other end is welded to the side wall of the clamping block 32, and the expansion and contraction direction of the return spring 125 is parallel to the sliding direction of the dust cover 322. The return spring 125 is used to drive the dust cover 322 to re-close at the notch of the clamping groove 321 under the action of the elastic force of the return spring 125 when the second pull rope 121 releases the pulling force on the dust cover 322.

[0043] Reference Figure 3 , Figure 5 and Figure 6 When the second torsion spring 124 is not deformed, the dust cover plate 322 covers the notch of the engaging groove 321. At this time, the end of the insertion rod 333 is inserted into the engaging groove 321. When the second pressure rod 123 presses the second rotating rod 122, the second rotating rod 122 rotates, and the second pull rope 121 will pull the dust cover plate 322 to slide during the rotation of the second rotating rod 122, so that the engaging groove 321 is opened. At this time, the return spring 125 is deformed, and the end of the insertion rod 333 is separated from the engaging groove 321; after the engaging rod 31 is inserted into the engaging groove 321, the pressure on the second pressure rod 123 is released. At this time, the dust cover plate 322 will be re-covered at the notch of the engaging groove 321 under the drive of the return spring 125, and the insertion rod 333 is inserted into the locking hole 312 of the engaging rod 31 to further prevent the engaging rod 31 from being separated from the engaging groove 321.

[0044] Reference Figure 3 and Figure 5 A rubber sealing strip is also bonded to the end wall of the head 1 facing the fuselage 2, and the sealing strip is arranged along the circumference of the head 1. A sealing groove 231 for inserting the sealing strip is also opened on the end wall of the fuselage 2 facing the head 1. When the end wall of the head 1 is attached to the end wall of the fuselage 2, the sealing strip can be inserted into the sealing groove 231 to increase the contact area between the head 1 and the fuselage 2, and improve the sealing of the joint between the head 1 and the fuselage 2.

[0045] The implementation principle of a multi-head power tool in an embodiment of the present application is as follows: When it is necessary to assemble the machine head 1 and the machine body 2, first manually move the first pressure rod 3343 into the chamber 21 and press against the first pressure rod 3343, so that the first pressure rod 3343 presses against the first rotating rod 3341, causing the first rotating rod 3341 to rotate while pulling the first pulling rope 335, so that the two clamping rods 31 open under the pulling of the first pulling rope 335. Then press against the second pressure rod 123, so that the dust-proof cover plate 322 and the insertion rod 333 slide away from the clamping groove 321, opening the notch of the clamping groove 321 and disengaging the insertion rod 333 from the clamping groove 321. Then move the machine head 1 and the machine body 2 closer to each other, insert the clamping block 32 between the two opened clamping rods 31. When the end wall of the machine head 1 abuts against the end wall of the machine body 2, first release the pressure on the first pressure rod 3343 and move the first pressure rod 3343 back into the fixing groove 22. At this time, the clamping rod 31 just inserts into the clamping groove 321. Then release the pressure on the second pressure rod 123, so that the dust-proof cover plate 322 covers the notch of the clamping groove 321, and at this time the dust-proof cover plate 322 is just located outside the clamping rod 31, and the insertion rod 333 is inserted into the locking hole 312. In summary, the stable splicing of the machine head 1 and the machine body 2 is realized through the mutual cooperation of the clamping rod 31 and the clamping groove 321 and the mutual cooperation of the insertion rod 333 and the locking hole 312.

[0046] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A multi-head power tool, comprising a tool head (1) and a tool body (2), characterized in that: A connecting mechanism (3) is jointly provided between the machine head (1) and the fuselage (2). The connecting mechanism (3) is used to connect or separate the machine head (1) and the fuselage (2); the connecting mechanism (3) includes a clamping rod (31), a clamping block (32) and a driving assembly (33). The clamping rod (31) is rotatably connected to the end wall of the fuselage (2) facing the machine head (1). The clamping block (32) is arranged on the end wall of the machine head (1) facing the fuselage (2). A clamping groove (321) for inserting the clamping rod (31) is arranged on the peripheral wall of the clamping block (32). The driving assembly (33) is used to drive the clamping rod (31) to rotate and insert into the clamping groove (321) when the end walls of the machine head (1) and the fuselage (2) facing each other are mutually attached. The driving assembly (33) includes a rotating shaft (331), a first torsion spring (332), a first pulling rope (335) and a docking member (334). The clamping rod (31) is rotatably connected to the end wall of the fuselage (2) through the rotating shaft (331). The first torsion spring (332) is sleeved on the rotating shaft (331). One end of the first torsion spring (332) is connected to the end wall of the fuselage (2), and the other end is connected to the side wall of the clamping rod (31). One end of the first pulling rope (335) is connected to the clamping rod (31). The docking member (334) is used to pull or release the first pulling rope (335) so that the clamping rod (31) rotates around the rotating shaft (331) under the action of the first pulling rope (335). The docking member (334) includes a first rotating rod (3341), a second torsion spring (3342) and a first pressing rod (3343). A cavity (21) is formed inside the fuselage (2). The first rotating rod (3341) is rotatably connected to the cavity (21) through a pin shaft. One end of the second torsion spring (3342) is connected to the side wall of the first rotating rod (3341), and the other end is connected to the inner wall of the cavity (21). One end of the first pulling rope (335) far from the clamping rod (31) is connected to the end of the first rotating rod (3341). The first pressing rod (3343) is used to press the first rotating rod (3341). The first pressing rod (3343) is located at one end of the first rotating rod (3341) far from the first pulling rope (335). The first rotating rod (3341) is located between the first pulling rope (335) and the first pressing rod (3343). The first pressing rod (3343) is slidably connected to the fuselage (2), and the end of the first rotating rod (3341) is located on the extension line of the sliding direction of the first pressing rod (3343).

2. The multi-head electric tool according to claim 1, characterized in that: The docking member (334) is located inside the cavity (21). A fixing groove (22) is formed in the side wall of the fuselage (2) along the circumferential direction of the fuselage (2). The fixing groove (22) is communicated with the cavity (21). A limiting spring (221) is arranged in the fixing groove (22). One end of the limiting spring (221) is connected to the inner wall of the fixing groove (22), and the other end is connected to the first pressing rod (3343).

3. The multi-head electric tool according to claim 1, characterized in that: A dust-proof cover plate (322) is slidably connected to the peripheral wall of the clamping block (32) near the clamping groove (321). The dust-proof cover plate (322) is used to open and close the notch of the clamping groove (321). A moving member (12) for driving the dust-proof cover plate (322) to slide and thus open and close the notch of the clamping groove (321) is provided on the machine head (1).

4. The multi-head electric tool according to claim 3, characterized in that: The moving member (12) includes a second pulling rope (121), a second rotating rod (122), a second pressing rod (123), a third torsion spring (124) and a return spring (125). The second rotating rod (122) is rotatably connected to the inside of the machine head (1). One end of the third torsion spring (124) is connected to the second rotating rod (122), and the other end is connected to the inside of the machine head (1). The second pressing rod (123) is slidably connected to the inside of the machine head (1) for pressing against the end of the second rotating rod (122). One end of the second pulling rope (121) is connected to the side wall of the dust-proof cover plate (322), and the other end is connected to one end of the second rotating rod (122) away from the second pressing rod (123). One end of the return spring (125) is connected to the dust-proof cover plate (322), and the other end is connected to the side wall of the clamping block (32). The telescopic direction of the return spring (125) is parallel to the sliding direction of the dust-proof cover plate (322).

5. The multi-head power tool according to claim 4, characterized in that: The moving member (12) further includes a plug rod (333). The plug rod (333) is slidably connected to the inside of the clamping block (32), and the sliding direction of the plug rod (333) is parallel to the sliding direction of the dust-proof cover plate (322). One end of the plug rod (333) is connected to the side wall of the dust-proof cover plate (322), and the other end penetrates through the clamping groove (321). A locking hole (312) for inserting the plug rod (333) is formed in the peripheral wall of the clamping rod (31).

6. The multi-head electric tool according to claim 1, characterized in that: A magnet sheet (311) is provided on the peripheral wall of the clamping rod (31), and an adsorption iron sheet (3211) magnetically attracted to the magnet sheet (311) is provided on the inner wall of the clamping groove (321).

7. The multi-head electric tool according to claim 1, characterized in that: A sealing strip is provided along the circumferential direction of the end wall of the machine head (1) facing the fuselage (2). A sealing groove (231) for inserting the sealing strip is formed in the end wall of the fuselage (2).

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